Support exception chains in debugger

[CallumJHays]

Hi, I may be doing something wrong, but it doesn't seem like the python debugger supports error chaining? For example:

The only error information shown is the outer exception, losing track of the original cause.

Error chaining works if run without the debugger (in a terminal):

Error Chaining (PEP 3134) Spec: https://www.python.org/dev/peps/pep-3134/

[theHamsta]

When I tried out debugpy with a custom debugger it return ExceptionInfo without any innerExceptions. Would be nice if this would be supported.